US4391703A - Marine sewage treatment with biological filter - Google Patents
Marine sewage treatment with biological filter Download PDFInfo
- Publication number
- US4391703A US4391703A US06/365,889 US36588982A US4391703A US 4391703 A US4391703 A US 4391703A US 36588982 A US36588982 A US 36588982A US 4391703 A US4391703 A US 4391703A
- Authority
- US
- United States
- Prior art keywords
- liquid
- chlorine
- sludge
- chamber
- aeration chamber
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1242—Small compact installations for use in homes, apartment blocks, hotels or the like
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/06—Aerobic processes using submerged filters
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Definitions
- the present disclosure is directed to an activated sludge sewage disposal system of the type adapted for marine use.
- the sewage apparatus consists of a central aeration chamber with aeration orifices located at the bottom. Typically a pair of biological filters along each side are positioned such that aerated sludge is circulated up and into the biological filters.
- a crossover pipe, connecting the two biological filters, is positioned below the top level of the sludge in the aeration chamber.
- An exit pipe and anti-syphon vent pipe are connected to the crossover pipe.
- Th exit pipe goes to the chlorine contact tank through a flexible hose.
- the chlorine contact tank is a two-section apparatus, the sections being separated by a vertical baffle.
- the filter has a filter medium of a plurality of hollow plastic balls that float on the aerated sludge. This provides contact area for aerobic treatment of the sludge.
- the buoyant balls are contained by an upper fiberglas grating and a lower fiberglas retention grating.
- the biological filter allows for both physical and biological filtering.
- Mason et al (U.S. Pat. No. 3,966,608) discloses a liquid treatment apparatus that has what appears to be an aeration area around impeller 40. Sludge then proceeds through filter media 30 in a recirculating manner.
- the principal interest revolves around the use of a plastic material for the filter media, using, for example, 3.5 inch Flexirings, having large surface contact area (see col. 2, lines 65 et seq.).
- Kielback U.S. Pat. No. 3,122,594 discloses a contact tower having a bed 25 comprised of spheres or balls 27 (e.g. table tennis balls) contained in the chamber 12 by grids 14 and 16.
- spheres or balls 27 e.g. table tennis balls
- Szczepanski (U.S. Pat. No. 3,648,439) discloses a buoyant filter mass having an enclosed area made of parallel rods 33, with the buoyant balls 32 located therein.
- the other noted references are of general background interest.
- a central aeration chamber is provided at each side with biological filters positioned that aerated sludge is circulated up from the central aeration chamber and into the biological filters.
- a crossover pipe connects the biological filters and is positioned below the top level of the sludge in the aeration chamber.
- An exit pipe and an anti-syphon vent piper are connected to the crossover pipe.
- the exit pipe communicates with the chlorine tank through a flexible hose.
- the chlorine tank is a two-section apparatus, the sections being separated by a baffle.
- the filter medium in the biological filters are a plurality of hollow plastic balls that float on the aerated sludge which provides a contact area for aerobic treatment of the sludge.
- the buoyant balls are contained by an upper and lower fiberglas grating.
- the biological filter permits of both physical and biological filtering.
- the floating sphere arrangement provides sinuous upward flow passages for the liquid that are large enough to prevent rapid clogging, and also are movable so that the filter can be cleaned easier and more effectively than a fixed media filter system.
- the elevation of the crossover pipe discharge is above the top of the filter tanks so that the filter tanks are completely full of water eliminating any air space in the clear water zone above the biological filter chamber, so that wave action will not stir up settled sludge and mix it in with the water being discharged. This would cause the effluent from the treatment unit to exceed allowable limits.
- the biological filter internal discharge piping arrangement maintains the liquid discharge level in equilibrium with the axis of rotation eliminate flow surges through the system resulting from vessel rolling and pitching.
- FIG. 1 is a front perspective view of the primary treatment tank and the chlorine contact tank together with their connections.
- FIG. 2 is a vertical sectional view taken on the lines 2--2 in FIG. 3 through the primary treatment tank.
- FIG. 3 is a horizontal sectional view taken on the lines 3--3 in FIG. 2.
- the sewage treatment unit consists of two interconnected metal tanks 10, 11 completely enclosed to prevent liquid from flowing out of the tanks due to rolling and pitching action of a vessel at sea.
- the two tanks are the primary treatment tank 10 and the chlorine contact tank 11.
- the sewage to be treated flows into the aeration chamber 12.
- Incoming sewage causes the gravity displacement of an equal volume of liquid into the two biological filter chambers 13, 14, into the chlorine contact tank 11, and from the chlorine contact tank to overboard.
- the filter discharges into the separate chlorine contact tank through a hose 15.
- the tops of the biological filter chambers 13, 14 are below the normal working level of the liquid in aeration chamber 12. This arrangement eliminates air pockets at the top of the biological filter chambers, and as a result there is no free surface for waves to develop and cause sloshing of the liquid. Sloshing of the liquid would stir up sludge, and prevent the sludge from remaining settled on and in the spherical filter elements 17.
- each of the two biological filter chambers 13, 14 is through an internal common interconnected pipe 18.
- a vertical riser and discharge line 19 defining therewith an inverted T-shaped crossover to carry the displaced liquid from each of the biological filter chambers into hose 15. The liquid then flows into chlorine contact tank 11.
- the elevation of discharge line 19 determines the working level of the liquid 20 in the aeration chamber 12.
- the position of the vertical riser into discharge line 19 is located at the axis of rotation for the plane of liquid in the aeration chamber. The location and elevation of the vertical riser prevent surging of the liquid and sludge through the system as a result of vessel rolling and/or pitching.
- the sewage treatment unit utilizes an aerobic biological process to remove the biodegradeable waste material from the sewage.
- the bacteria naturally contained in the incoming sewage grow and multiply in the aeration tank liquid using the waste material in the sewage as their food supply.
- a biological sludge or floc is produced that continuously reacts with the sewage waste that has entered the aeration tank.
- a continuous supply of dissolved oxygen must be maintained in the liquid flowing through the sewage treatment unit.
- the dissolved oxygen supplied is obtained primarily from air which is discharged from stainless steel nonclog air diffusers 21 installed near the bottom of the aeration tank.
- the air flow from the diffusers up through the liquid in the aeration tank causes turbulence and circulation of the liquid. This effect results in complete mixing of the unprocessed waste with the active biological floc in the liquid. This action will advance and increase the frequency of contact of waste with the floc in the aeration tank, and ensure effective and rapid waste removal.
- the turbulence in the aeration tank will prevent sludge and waste solids from building up on the bottom of the aeration tank.
- the air from the aeration tank diffusers is discharged to atmosphere by means of an atmospheric vent line 22 connected to the tank.
- the liquid flowing up from the bottom of the filtr tank will pass over the surface of several layers of plastic spheres 17.
- the plastic spheres are about 13/4 inches in diameter and are hollow.
- the spheres will float, but are kept below the surface of the liquid by fiberglas grating 24 that functions as a retention screen for the spheres.
- a second fiberglas retention grating 5 is installed below the layers of spheres 17 to keep the spheres from being washed out when the filter is being cleaned.
- honeycomb fixed media consists of relatively large vertical flow channels that induce a sinuous flow pattern.
- the flow channels are separated and have a relatively large cross sectional flow area for each channel since the liquid is aerated and the air must rise up through the channels with the liquid. Only liquid flows through the arrangement using plastic spheres, the relatively small flow passages around the spheres provides a restriction that will physically trap solids. This physical filtration effect will not occur in systems using the honeycomb fixed media biological filtration systems.
- Filtration systems using a granular type media such as sand or gravel are primarily physical filtration systems.
- the plastic spheres are not intended to provide the same degree of physical filtration possible with granular type filters because the filter would clog up very rapidly.
- Another significant feature of the floating plastic sphere arrangement is that it will permit more effective cleaning than a system using the fixed media arrangement.
- the fiberglas retention grating on the top of the filter can be removed.
- the plastic spheres 17 can then be stirred around with a wooden stick and rinsed off with a water hose. If necessary, some of the spheres can be removed to provide easier access to rinse off the spheres in the bottom. Since the spheres are not fixed media, they can be moved around easily for more effective cleaning.
- the biological waste removal reaction in the biological filter is also aerobic.
- the aeration rate of the liquid in the aeration tank is designed to be high enough so that the level of dissolved oxygen in the liquid flowing from the aeration tank into the biological filter tank will contain enough residual dissolved oxygen to keep the process aerobic.
- Air supply for the sewage treatment unit is obtained from a positive displacement blower 26.
- the vessels air supply can be used for standby service air instead of the blower.
- the air flow to the aeration tank diffusers 21 are controlled by valve 27.
- the clear liquid discharge from the biological filter accumulates on top of the filter and is eventually displaced into pipe 18.
- the accumulation of the clarified liquid on top of the filter provides additional retention time for solids settling in the event solids should carry over from the filter.
- the clarified liquid provides a residual clear water volume that will be displaced before liquid flowing up through the filter is discharged.
- the vertical riser into discharge line 19 has a short nipple installed in the top of the line which functions as an antisyphon vent 28.
- the antisyphon vent 28 prevents continuous discharge of liquid into the chlorine contact chamber 30 has valve 39 to isolate the chlorine contact chamber 11 through hose 15 after sewage has stopped flowing into the aeration chamber.
- Brackets are installed around the perimeter of the fiberglas retention grating to prevent liquid from short circuiting the filter element and flowing up between the tank wall and spheres.
- the clear liquid displaced from the top of the biological filters into hose 15 will flow down into the chlorine contact chamber 11.
- a chlorine disinfectant chemical such as ordinary laundry bleach
- the liquid discharge from hose 15 mixes with the chlorine disinfection chemical (ordinary laundry bleach) in the bottom part of the chlorine contact chamber.
- the chlorine contact chamber volume is designed to provide adequate retention time for disinfection prior to discharge through the discharge connection 30.
- the chlorinated liquid must flow under and up through baffle 31 before entering the inlet to discharge 30. This arrangement will promote mixing of the liquid for disinfection.
- the treated liquid can also be pumped overboard. Discharge pumping arrangement not shown.
- the liquid chlorine disinfectant chemical is stored in a separated plastic chemical tank 32, and injected by gravity flow into the chlorine contact chamber at a connection through plastic tubing 33.
- the chlorine chemical flow control is by means of a PVC needle valve 34.
- a chemical injection pump can be used instead of the gravity injection arrangement shown.
- Access hatches 35 on top of the biological filters can be removed for flushing the filter with a water hose from the top.
- the aeration tank 10 has an access hatch 36 and drain valves 37 as does the chlorine chamber 11, at 38 respectively.
- the discharge from the chlorine contact chamber 30 has valve 39 to isolate the chlorine contact chamber while draining other tanks.
- Each biological filter chamber has a vent valve 40 to vent air from the chamber when filling the unit during start-up operation.
- vent and intake connections can be positioned on any side to accommodate installation requirements for specific vessels.
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- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
Description
______________________________________ 3122594 Kielback 3825119 Rost 3409279 Metrailer 3956128 Turner 3543937 Choun 3966608 Mason et al 3648439 Szczepanski 4159945 Savage ______________________________________
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/365,889 US4391703A (en) | 1980-08-05 | 1982-04-06 | Marine sewage treatment with biological filter |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US17540080A | 1980-08-05 | 1980-08-05 | |
US06/365,889 US4391703A (en) | 1980-08-05 | 1982-04-06 | Marine sewage treatment with biological filter |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US17540080A Continuation | 1980-08-05 | 1980-08-05 |
Publications (1)
Publication Number | Publication Date |
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US4391703A true US4391703A (en) | 1983-07-05 |
Family
ID=26871170
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US06/365,889 Expired - Fee Related US4391703A (en) | 1980-08-05 | 1982-04-06 | Marine sewage treatment with biological filter |
Country Status (1)
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US (1) | US4391703A (en) |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4521311A (en) * | 1982-07-29 | 1985-06-04 | Linde Aktiengesellschaft | Activated sludge system with integrated regenerator |
US4886607A (en) * | 1989-03-15 | 1989-12-12 | Aqua Trend Systems Inc. | Apparatus for filtering, retaining and disposal of waste water accumulated on a boat |
US4933524A (en) * | 1988-06-17 | 1990-06-12 | Envirotech Corporation | Clarifier apparatus and methods with 3-D arrays |
US4963257A (en) * | 1988-03-25 | 1990-10-16 | Schulz Christopher R | Buoyant coarse media flocculator |
US5041216A (en) * | 1988-09-02 | 1991-08-20 | Bayer Aktiengesellschaft | Fluidized bed reactor for biological purification of effluent |
US5190648A (en) * | 1988-11-10 | 1993-03-02 | Ramsauer Larry R | Water purifying method and apparatus |
US5330652A (en) * | 1993-02-26 | 1994-07-19 | Aquafuture, Inc. | Fluidized bed reactor and distribution system |
US5458779A (en) * | 1990-01-23 | 1995-10-17 | Kaldnes Miljoteknologi A/S | Method for purification of water |
EP0717009A1 (en) * | 1994-12-13 | 1996-06-19 | Anglian Water Services Ltd. | Water treatment process and apparatus |
US5609754A (en) * | 1995-09-07 | 1997-03-11 | Stuth; William L. | Secondary sewage treatment system |
US5897997A (en) * | 1995-05-19 | 1999-04-27 | Rhone-Poulenc Chimie | Reactor for implementing chemical reactions involving a biomass |
US5928514A (en) * | 1996-11-05 | 1999-07-27 | Sea Sanitizer Internation, L.L.C. | On board treatment system |
US5985148A (en) * | 1997-12-12 | 1999-11-16 | Liu; Kai Yuan | Water treatment filter wool balls |
US6207047B1 (en) | 1996-11-05 | 2001-03-27 | Sea Sanitizer International, L.L.C. | Wastewater treatment system |
WO2003048053A1 (en) * | 2001-12-03 | 2003-06-12 | Evac International Oy | Sewage treatment plant |
US20030226805A1 (en) * | 2002-06-06 | 2003-12-11 | Industrial Technology Research Institute | Method of wastewater treatment with biological active carbon using recycled oxygen-enriched water and apparatus used therein |
US20060180546A1 (en) * | 2005-02-15 | 2006-08-17 | William L. Stuth, Sr. | Wastewater treatment system and method |
US20070163954A1 (en) * | 2004-01-06 | 2007-07-19 | Badreddine Hassan H | Waste water treatment plant and method |
CN101708891B (en) * | 2009-10-31 | 2011-08-17 | 华南理工大学 | Aerated biological activated carbon filters and method of applying same to purify feed water |
CN102267757A (en) * | 2011-06-29 | 2011-12-07 | 无锡强工机械工业有限公司 | Biomass three-phase separator device |
CN102276116A (en) * | 2011-07-13 | 2011-12-14 | 李�杰 | Integrated three-phase separation purifier |
US8999166B1 (en) * | 2012-11-18 | 2015-04-07 | Angel Torres-Collazo | Tank access hatch and cleaning method |
Citations (16)
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US2901114A (en) * | 1957-04-17 | 1959-08-25 | Mcphee | Sewage treatment apparatus |
US3122594A (en) * | 1958-07-29 | 1964-02-25 | Aluminium Lab Ltd | Apparatus and procedure for contact between fluids |
US3409279A (en) * | 1966-10-06 | 1968-11-05 | Exxon Research Engineering Co | Method of contacting liquids and gases |
US3412864A (en) * | 1966-07-05 | 1968-11-26 | Okada Tamotsu | Sewage treatment plant |
US3543937A (en) * | 1968-08-02 | 1970-12-01 | Joseph M Choun | Filter media |
US3648439A (en) * | 1969-04-01 | 1972-03-14 | Harry Szczepanski | Buoyant filter mass |
US3713543A (en) * | 1968-09-23 | 1973-01-30 | Dravo Corp | Activated sewage plant |
US3825119A (en) * | 1973-03-08 | 1974-07-23 | K Rost | Waste water treatment unit |
US3956128A (en) * | 1973-07-16 | 1976-05-11 | Degremont, S.A. | Apparatus for treating industrial and domestic waste waters |
US3956127A (en) * | 1972-01-26 | 1976-05-11 | European Plastic Machinery Mfg A/S | Apparatus for establishing contact between a liquid and a gas |
US3966608A (en) * | 1974-03-01 | 1976-06-29 | Ecodyne Corporation | Liquid treatment apparatus |
US3980561A (en) * | 1974-03-12 | 1976-09-14 | Hitachi Chemical Company, Ltd. | Device for purifying sewage |
US4028244A (en) * | 1972-01-26 | 1977-06-07 | European Plastic Machinery Mfg. A/S | Apparatus for establishing contact between a liquid and a gas |
US4069156A (en) * | 1974-07-05 | 1978-01-17 | Ecodyne Corporation | Sewage treatment system |
US4159945A (en) * | 1973-10-31 | 1979-07-03 | Dravco Corporation | Method for denitrification of treated sewage |
US4253957A (en) * | 1979-10-09 | 1981-03-03 | Red Fox Industries Inc. | Marine sewage disposal |
-
1982
- 1982-04-06 US US06/365,889 patent/US4391703A/en not_active Expired - Fee Related
Patent Citations (16)
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US2901114A (en) * | 1957-04-17 | 1959-08-25 | Mcphee | Sewage treatment apparatus |
US3122594A (en) * | 1958-07-29 | 1964-02-25 | Aluminium Lab Ltd | Apparatus and procedure for contact between fluids |
US3412864A (en) * | 1966-07-05 | 1968-11-26 | Okada Tamotsu | Sewage treatment plant |
US3409279A (en) * | 1966-10-06 | 1968-11-05 | Exxon Research Engineering Co | Method of contacting liquids and gases |
US3543937A (en) * | 1968-08-02 | 1970-12-01 | Joseph M Choun | Filter media |
US3713543A (en) * | 1968-09-23 | 1973-01-30 | Dravo Corp | Activated sewage plant |
US3648439A (en) * | 1969-04-01 | 1972-03-14 | Harry Szczepanski | Buoyant filter mass |
US4028244A (en) * | 1972-01-26 | 1977-06-07 | European Plastic Machinery Mfg. A/S | Apparatus for establishing contact between a liquid and a gas |
US3956127A (en) * | 1972-01-26 | 1976-05-11 | European Plastic Machinery Mfg A/S | Apparatus for establishing contact between a liquid and a gas |
US3825119A (en) * | 1973-03-08 | 1974-07-23 | K Rost | Waste water treatment unit |
US3956128A (en) * | 1973-07-16 | 1976-05-11 | Degremont, S.A. | Apparatus for treating industrial and domestic waste waters |
US4159945A (en) * | 1973-10-31 | 1979-07-03 | Dravco Corporation | Method for denitrification of treated sewage |
US3966608A (en) * | 1974-03-01 | 1976-06-29 | Ecodyne Corporation | Liquid treatment apparatus |
US3980561A (en) * | 1974-03-12 | 1976-09-14 | Hitachi Chemical Company, Ltd. | Device for purifying sewage |
US4069156A (en) * | 1974-07-05 | 1978-01-17 | Ecodyne Corporation | Sewage treatment system |
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Cited By (31)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4521311A (en) * | 1982-07-29 | 1985-06-04 | Linde Aktiengesellschaft | Activated sludge system with integrated regenerator |
US4963257A (en) * | 1988-03-25 | 1990-10-16 | Schulz Christopher R | Buoyant coarse media flocculator |
US4933524A (en) * | 1988-06-17 | 1990-06-12 | Envirotech Corporation | Clarifier apparatus and methods with 3-D arrays |
US5041216A (en) * | 1988-09-02 | 1991-08-20 | Bayer Aktiengesellschaft | Fluidized bed reactor for biological purification of effluent |
US5190648A (en) * | 1988-11-10 | 1993-03-02 | Ramsauer Larry R | Water purifying method and apparatus |
US4886607A (en) * | 1989-03-15 | 1989-12-12 | Aqua Trend Systems Inc. | Apparatus for filtering, retaining and disposal of waste water accumulated on a boat |
US5543039A (en) * | 1990-01-23 | 1996-08-06 | Kaldnes Miljoteknologi A/S | Reactor for purification of water |
US5458779A (en) * | 1990-01-23 | 1995-10-17 | Kaldnes Miljoteknologi A/S | Method for purification of water |
USRE36660E (en) * | 1993-02-26 | 2000-04-18 | Aquafuture, Inc. | Fluidized bed reactor and distribution system |
US5330652A (en) * | 1993-02-26 | 1994-07-19 | Aquafuture, Inc. | Fluidized bed reactor and distribution system |
EP0717009A1 (en) * | 1994-12-13 | 1996-06-19 | Anglian Water Services Ltd. | Water treatment process and apparatus |
US5897997A (en) * | 1995-05-19 | 1999-04-27 | Rhone-Poulenc Chimie | Reactor for implementing chemical reactions involving a biomass |
US5609754A (en) * | 1995-09-07 | 1997-03-11 | Stuth; William L. | Secondary sewage treatment system |
US5928514A (en) * | 1996-11-05 | 1999-07-27 | Sea Sanitizer Internation, L.L.C. | On board treatment system |
US6207047B1 (en) | 1996-11-05 | 2001-03-27 | Sea Sanitizer International, L.L.C. | Wastewater treatment system |
US5985148A (en) * | 1997-12-12 | 1999-11-16 | Liu; Kai Yuan | Water treatment filter wool balls |
WO1999037588A1 (en) * | 1998-01-27 | 1999-07-29 | Sea Sanitizer International, L.L.C. | On board treatment system |
WO2003048053A1 (en) * | 2001-12-03 | 2003-06-12 | Evac International Oy | Sewage treatment plant |
US20050103696A1 (en) * | 2001-12-03 | 2005-05-19 | Evac International Oy | Sewage treatment plant |
US7077958B2 (en) | 2001-12-03 | 2006-07-18 | Evac International Oy | Sewage treatment plant |
US20030226805A1 (en) * | 2002-06-06 | 2003-12-11 | Industrial Technology Research Institute | Method of wastewater treatment with biological active carbon using recycled oxygen-enriched water and apparatus used therein |
US7488413B2 (en) * | 2004-01-06 | 2009-02-10 | Bioshaft Water Technology, Inc | Waste water treatment plant and method |
US20070163954A1 (en) * | 2004-01-06 | 2007-07-19 | Badreddine Hassan H | Waste water treatment plant and method |
US20070007202A1 (en) * | 2005-02-15 | 2007-01-11 | Stuth William L Sr | Wastewater treatment system and method |
US7252766B2 (en) | 2005-02-15 | 2007-08-07 | William L. Stuth, Sr. | Wastewater treatment system and method |
US20060180546A1 (en) * | 2005-02-15 | 2006-08-17 | William L. Stuth, Sr. | Wastewater treatment system and method |
CN101708891B (en) * | 2009-10-31 | 2011-08-17 | 华南理工大学 | Aerated biological activated carbon filters and method of applying same to purify feed water |
CN102267757A (en) * | 2011-06-29 | 2011-12-07 | 无锡强工机械工业有限公司 | Biomass three-phase separator device |
CN102267757B (en) * | 2011-06-29 | 2013-02-13 | 无锡强工机械工业有限公司 | Biomass three-phase separator device |
CN102276116A (en) * | 2011-07-13 | 2011-12-14 | 李�杰 | Integrated three-phase separation purifier |
US8999166B1 (en) * | 2012-11-18 | 2015-04-07 | Angel Torres-Collazo | Tank access hatch and cleaning method |
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